The gable cabin they designed and built themselves is tiny by every measure—roughly 193 square feet on the ground floor. But as compact as it is, every space has a use: floor-to-ceiling cabinets store household items and clothing; a breakfast table pulls out from the wall; the cooking area features a full stove; and a loft above the kitchen houses a king-size bed. To bring in light, they used polycarbonate panels to create large front doors and paneling in the loft that frames a window.